Electric switch.



G. H. TAYLOR.

ELEGTRIG SWITCH.

APPLICATION FILED 12.7, 1911.

1,023,691 Patented Apr. 16, 1912.

WITNESSES N INVENTOR G'aRE/f 7i71 4 ofi,

ATTORNEYS UNITED STAILES PATENT OFFICE.

GEORGE HENRY TAYLOR, OF HELENA, MONTANA.

ELECTRIC SWITCH.

To all whom it may concern:

do it known that I, GEORGE H. TAYLOR, a citizen of the United States, and. a resident of Helena, in the county of Lewis and Clark and State of Montana, have made certain new and useful Improvements in Electric Switches. of which the following is a specification.

My invention relates to improvei'nents in electric switches for dental engines, and it consists in the combinations, constructions and arrangements herein described and claimed.

An object of my invention is to provide a device which may be used in lieu of a foot switch or in connection therewith for supplying current to the motor of an electrical dental engine.

A further object of my invention is to provide an electric switch which operates automatically as the bracket upon which the motor is carried is extended into operative position or is pushed back into inoperative position, thus relieving the operator of the necessity of manipulating the switch every time the electric circuit, which actuates the motor. is opened or closed.

A further object of my invention is to provide a device of simple nature which may be readily attached to the brackets of the electrical dental engines in common use.

Other objects and advantages will appear in, the following specification. and the novel features of the device will be particularly pointed out in the appended claims.

My invention is illustrated in the accompanying drawings forming part of this ap plication in which Figure 1v is a side view of an electrical dental bracket equipped with my improved. switch showing the bracket extended, Fig. 1 is a portion of a similar view showing the position of the parts when the bracket is closed, Fig. 2 is an enlarged section through the switch on the line 2 -2 of Fig. 1, and Fig. 3 is a section along the line 3 3 of Fig. 2, looking in the direction of the arrows.

My invention, as stated above, is designed to be used as an attachment for the brackets of electrical dental engines. The bracket which I have illustrated in the drawing, may be taken as a type. It will be understood that any bracket the parts of which have a movement toward and away from a Specification. of Letters Patent.

Application filed April 7, 1911.

Patented Apr. 16,1912.

Serial No. 619,551.

stationary pivot rod might be conveniently equipped with my device.

Referring now particularly to Fig. 1, I have shown therein a bracket consisting of a wall plate 1 secured to the wall. 2, or to any other convenient support, and provided with the integral arms 1 and 1 Secured between the arms 1 and 1 is a pivotbolt or rod A second rod 4 is iiivotally secured to the rod 3 by means of the arms 5 and 6. Disposed on the rod 4: is a slidable sleeve 7 provided with an extension 7 to which is pivotally connected a link 8. A second link 9 has a pivotal connection 10 with the link 8 and with the rod 11. A similar rod 1'2 is pivotally connected at 1.3 with an extension (i of the arm 6 and also with the link 9. The bracket arms 1.1 and 12 are joined to the arms 13 and 11 by means of a sliding ring joint 15. The arms 13 and 14 are pivotally connected with the links 16 and 17, the former being connected with the support 18 for a rod 19, and the latter being connected with the sleeve 20 similar to the sleeve 7 already described. The motor M is carried by the rod 19.

The apparatus thus far described is ordinary and forms no part of my invention except in so far as it cooperates with the switch in operating the latter.

The switch itself is shown in Figs. 2 and It consists of two portions A and B hinged together at C. These port-ions are made of insulating material such as rubber, and are normally kept apart by means of a spring S. The portion B is provided with a pair of clamp hooks H which are secured by nuts 71. in any position. One end of the portion 13 is provided with a binding post D which; is electrically connected by a con ductor (Z to an arc-shaped contact E. The part A is provided with a binding post F which is connected by a conductor f to acontact G arranged to engage the contact E. The part A is also provided with a pivoted loop K which fits over the part B as shown in Fig. 1.

From the foregoing description of the various parts of the device the operation thereof may be readily understood.

The switch is clamped to the rod 3 by means of the clamps H in the manner shown in Figs. 1 and A spring L is fastened to the loop K and to the end of the spring is fastened a chain 0, the end of the chain being in turn fastened to a pin P secured to the pivot pin 10. Normally the bracket will be pushed inwardly into the position shown in Fig. 1. In this position the pin P is nearer the post 3 than it is in Fig. l. Tension on the spring L is therefore relieved and the contacts G and E are forced apart by means of the spring S. It is understood, of course, that the wires which supply current to the motor are connected through the switch at the points F and D. Current will be out off from the motor as long as the apparatus is in the position shown in Fig. 1 but when the bracket is extended into the position shown in Fig. 1, which of course is the position in which the operator uses the engine, then the tension on the spring L through the chain 0 will cause the closing of the switch in the manner shown in Fig. 2. The provision of the spring L permits the switch to close whenever the bracket is moved a certain distance. If it is moved beyond this distance the spring merely stretches to allow an outward movement of the pin P. It will be seen that the switch thus acts automatically to open and close the circuit to the motor thus obviating the necessity of a manual closing of the circuit each time it is desired to start the engine.

I claim 1. The combination with a dental bracket having a stationary pivot rod and parts movable toward and away from said rod, of a switch secured to said stationary rod and having a connection with one of said movable members, the movement of said movable member away trom the rod serving to close the switch and the movement toward the rod serving to permit the opening of the switch.

2. The combination with a dental bracket having a stationary pivot rod and a member movable toward and away from said rod, of a two-part switch, one part being secured to said stationary rod and being provided with a contact, and the other part being also provided with a contact having a yielding connection with said movable member, the movement of said movable member away from the rod serving to bring said contacts into engagement, and the movement of the movable member toward the rod serving to permit the contacts to be brought out of engagement.

3. The combination with a dental bracket having a stationary pivot rod and parts movable toward and away from said rod of a switch, said switch comprising two insulating members hinged together, a spring for normally keeping said hinged members apart, each of said hinged members being provided with a contact adapted to engage the contact on the other member, one of said insulating members being secured to said stationary pivot rod and the other of said insulating members being provided with a loop encircling its companion member, a spiral spring secured to said loop, and a chain for connecting said spi'al spring with one of said movable members.

GEORGE HENRY TAYLOR. \Vitnesses:

Tnos. E. GooowiN, J. U. SANDERS.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents. Washington, D. C. 

